On Thu, 12 Sep 2024 09:21:07 +0200
Hanno Böck <[email protected]> wrote:

> But there's a larger question whether there even is a reliable "source
> of truth" for whois servers. Does IANA make any guarantees that the
> whois servers they advertise are operational, and under control of the
> respective TLD authority?

To answer myself: It appears multiple whois servers listed by IANA are
not operational.
This is true for the following TLDs:
cf ci dz ec gn gp hm iq ml na sb tk to uy xn--lgbbat1ad8j xn--mgbtx2b
xn--ygbi2ammx

It therefore strongly appears to me that there is currently no reliable
data source for whois servers, and therefore, it is unclear how domain
validation via whois can be implemented securely.

-- 
Hanno Böck - Independent security researcher
https://itsec.hboeck.de/
https://badkeys.info/

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